kozy heat Slayton 42S User manual

 Do not store or use gasoline or other
ammable vapors and liquids in the vicinity of
this or any other appliance.
 WHAT TO DO IF YOU SMELL GAS
 Do not try to light any appliance.
 Do not touch any electrical switch; do not
use any phone in your building.
 Immediately call gas supplier from a
neighbors phone. Follow the gas supplier
instrucons.
 If you cannot reach your gas supplier, call
the re department.
 Installaon and service must be performed by
a qualied installer, service agency or the gas
supplier.
WARNING: If the informaon in these
instrucons are not followed exactly, a re or
explosion may result causing property damage,
personal injury, or loss of life.
INSTALLER: Leave this manual with the
appliance.
CONSUMER: Retain this manual for future
reference.
This appliance may be installed in an
aermarket, permanently located,
manufactured home (USA only) or mobile
home, where not prohibited by local codes.
This appliance is only for use with the type of
gas indicated on the rang plate. This appliance
is not converble for use with other gases,
unless a cered kit is used.
DIRECT VENT LINEAR FIREPLACE
HUSSONG MFG. CO., INC.
Model: #SLA-42S
INSTALLATION AND OPERATION MANUAL
English and French installaon
manuals available through your
local dealer, or visit our website
www.kozyheat.com
A barrier designed to reduce the risk of burns from the hot viewing glass
is provided with this appliance and shall be installed.
WARNING
HOT GLASS WILL CAUSE BURNS.
DO NOT TOUCH GLASS UNTIL COOLED.
NEVER ALLOW CHILDREN TO TOUCH GLASS.
Report No. 216-S-36d-6.5 ● SLA-42S-REV-01 ● December 2013

Read this manual before installing or operating this appliance.
Please retain this owner’s manual for future reference.
CONGRATULATIONS!
We welcome you as a new owner of a Kozy Heat gas fireplace. Kozy Heat products are designed with
superior components and materials; assembled by trained craftsmen who take pride in their work. The
burner and valve assembly are 100% test-fired, and the complete fireplace is thoroughly inspected before
packaging to ensure you receive a quality product. Our commitment to quality and customer satisfaction
has remained the same for over 30 years. We offer a complete line of gas and wood fireplaces, unique
cabinets and stylish accessories to complement any décor. Adding a fireplace is one of the best ways to
increase the value of your home, and we are proud to offer a network of dealers throughout the country to
help make your experience everything you could imagine. We pride ourselves in being dedicated not only to
functionality and reliability, but also customer safety. We offer our continual support and guidance to help
you achieve the maximum benefit and enjoyment from your Kozy Heat gas fireplace.
Dudley Hussong
Board Chairman
Jim Hussong
President
Homeowner Reference Information
We recommend you record the following information:
Model Name: Date purchased/installed:
Serial Number: Location on fireplace:
Dealership purchased from: Dealer Phone:
Notes:

HOMEOWNER REFERENCE INFORMATION 1
TABLE OF CONTENTS 2
1.0 INTRODUCTION 3
1.1 Appliance Certification 3
1.2 Safety Information 3
1.3 Commonwealth of Massachusetts Requirements 4
2.0 SPECIFICATIONS 5
2.1 Components List 5
2.2 BTU Specifications 5
2.3 Gas Information 5
2.4 Placement Clearance Requirements 6
2.5 Installation Overview 6
2.6 Appliance Dimensions and Clearances 7
3.0 FIREPLACE PREPARATION 8
3.1 Stand-Off Assembly and Installation 8
3.2 Nailing Flange Assembly and Installation 9
4.0 FRAMING 10
4.1 Wall Enclosure Rough Opening 10
4.2 Floor Support and Protection 11
4.3 Vent Termination Framing 11
5.0 MANTEL REQUIREMENTS 12
6.0 TYPICAL INSTALLATION OPTIONS 13
6.1 Horizontal Installation 13
6.2 Vertical Installation 13
6.3 Corner Installation 13
7.0 RECESS CONSTRUCTION 14
7.1 Television Positioning Considerations 14
7.2 Recess Framing and Clearances 14
8.0 FACING AND FINISHING 15
9.0 GAS LINE CONNECTION 16
9.1 Gas Conversion 16
9.2 High Altitude Installations 16
10.0 WIRING SCHEMATICS 17
11.0 VENTING 18
11.1 Approved Vent Systems 18
11.2 Restrictor Assembly and Installation 18
11.3 Venting for Horizontal Terminations 18
11.4 Venting for Vertical Terminations 20
11.5 Vent Heat Shield Assembly Installation 21
11.6 Elbows 22
11.7 Horizontal and Vertical Combination Venting 22
11.8 #800-1 Series Direct Vent Termination Kit(s) 23
11.9 Termination Vent Cap Clearances 24
11.10 Vertical Vent Termination Clearances 25
TABLE OF CONTENTS
2
13.0 FIREPLACE SETUP 29
13.1 Glass Frame Assembly 29
13.2 Safety Barrier Installation 29
13.3 Light Kit 31
13.4 Glass Media 31
13.5 Control Board 32
14.0 CONTROL SYSTEM COMPONENTS 33
14.1 Remote Control 33
14.2 Gas Valve 33
14.3 Pilot Assembly 33
15.0 SYSTEM OPERATION 34
15.1 Prepare Components 34
15.2 Initialize the Control System for the First Time 34
15.3 Adjust Temperature Display 34
15.4 Turn ON the Appliance 34
15.5 Turn OFF the Appliance 34
15.6 Control Flame Manually with Remote Control 35
15.7 Remote Control Thermostat Operation 35
15.8 Fan Speed Control 36
15.9 Accent Light Kit 36
15.10 Key Lock 36
15.11 Low Battery Detection 36
15.12 Continuous Pilot / Intermittent Pilot (CPI/IPI) 37
15.13 Reset System for Manual Operation 37
15.14 Automatic Safety Restart 37
15.15 Control Module Ignition Sequence Information 37
15.16 Additional Diagnostic Indications Information 38
16.0 LIGHTING AND SHUTDOWN 39
16.1 Operating Instructions 40
16.2 To Turn Gas Off to Appliance 40
17.0 PRESSURE TESTING 41
17.1 Inlet Pressure Test 41
17.2 Manifold Pressure Test 41
18.0 FINALIZING THE INSTALLATION 42
18.1 Flame Appearance 42
18.2 Burner Tube Venturi 42
18.3 Restrictors 43
19.0 TROUBLESHOOTING 44
19.1 Pilot Will Not Light / Stay Lit 44
19.2 Pilot Flame Always On / Will not Extinguish 44
19.3 Main Flame Will Not Light 44
19.4 Pilot and Burner Extinguish While in Operation 45
19.5 Glass Sooting 45
19.6 Flame Burns Blue and Lifts Off Burner 45
19.7 No Reaction to Command 45
20.0 MAINTENANCE 46
20.1 Control Board System 46
20.2 Fan 46
20.3 Vent System 46
20.4 Glass Assembly 46
21.0 REPLACEMENT PARTS LIST 47
LIMITED WARRANTY 48
49
LIFETIME WARRANTY
12.0 #970 HEAT DUCT KIT 26
12.1 Specifications 26
12.2 Attach Duct to Fireplace 26
12.3 Install Register Mounting Frame and Junction Box 27
12.4 Install and Wire Fan Assembly 27
12.5 Run and Secure Duct Pipe 28
12.6 Complete the Installation 28
12.7 Operating Instructions 28
12.8 Maintenance 28

3
This appliance has been tested by OMNI-Test Laboratories located in Portland, Oregon and complies with:
ANSI Z21.88a-2012/CSA 2.33a-2012, “Vented Gas Fireplace Heaters”
CGA 2.17-M91 (R2009), “Gas-Fired Appliances for Use at High Altitudes”
CSA P.4.1-2009, “Testing Method for Measuring Annual Fireplace Efficiency”
This installation must conform with local codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.1
This appliance, when installed, must be electrically grounded in accordance with local codes, or in the absence of local codes, with
the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1
1.0 INTRODUCTION
1.1 Appliance Certification
 Installation and repair should be done only by a qualified service person. The appliance should be inspected by a
qualified service person before use. Annual inspection by a qualified service person is required to maintain
warranty. More frequent cleaning may be required due to excessive lint from carpeting, bedding materials, etc. It is
imperative that control compartments, burners, and circulation air passageways of the appliance be kept clean.
 If this appliance is installed directly on carpeting, tile, or other combustible material other than wood flooring, the
appliance shall be installed on a metal or wood panel extending the full width and depth of the appliance.
 Children and adults should be alerted to the hazards of high surface temperatures and should stay away to avoid
burns or clothing ignition.
 Young children should be carefully supervised when they are in the same room as the appliance. Toddlers, young
children, and others may be susceptible to accidental contact burns. A physical barrier is recommended if there
are at-risk individuals in the house. To restrict access to a fireplace or stove, install an adjustable safety gate to
keep toddlers, young children, and other at-risk individuals out of the room and away from hot surfaces.
 Clothing or other flammable material should not be placed on or near the appliance.
 Adequate accessibility clearances for servicing and proper operation must be maintained.
 This appliance must not share, or be connected, to a chimney flue serving any other appliance.
 Keep area around the appliance clear of combustible materials, gasoline, and other flammable vapor and liquids.
 The flow of combustion and ventilation air must not be obstructed.
 Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies.
 The glass front, or any part removed for servicing the appliance, must be replaced prior to operating the appliance.
Work should be done by a qualified service technician.
 Clean glass only when cool and only with non-abrasive cleansers.
 WARNING: DO NOT OPERATE APPLIANCE WITH THE GLASS/FRAME ASSEMBLY REMOVED, CRACKED, OR
BROKEN. REPLACEMENT OF THE GLASS SHOULD ONLY BE PERFORMED BY A LICENSED OR
QUALIFIED SERVICE PERSON.
 The glass assembly, Part #SL42-057T, shall only be replaced as a complete unit, as supplied by Hussong Mfg. Co.,
Inc. DO NOT SUBSTITUTE MATERIALS.
 Do not strike or slam glass assembly.
 A safety barrier designed to reduce the risk of burns from the hot viewing glass is provided with this appliance and
shall be installed.
 Any safety screen, guard, or barrier removed for servicing the appliance must be replaced prior to operating the
appliance.
 If the safety barrier becomes damaged, the barrier shall be replaced with the manufacturer’s barrier for this
appliance.
 For use only with the following safety barriers: part numbers SL42-MSFS, SL42-RSFS, SL42-BSFS, and SL42-
CXCFS, as supplied by Hussong Mfg. Co., Inc.
 Under no circumstances should any solid fuel (wood, coal, paper, cardboard, etc.) be used in this appliance.
 Keep burner and control compartment clean.
 Do not use this fireplace if any part has been under water. Immediately call a qualified service technician to inspect
this appliance and to replace any part of the control system and any gas control which has been under water.
1.2 Safety Information

4
1.3 Commonwealth of Massachusetts Requirements
The following requirements reference various Massachusetts and national codes not contained in this manual.
For all sidewall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for
residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is
less than (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following require-
ments shall be satisfied:
1.3.1 Installation of Carbon Monoxide Detectors
At time of installation of side wall horizontally vented gas fueled equipment, the installing plumber or gas-fitter shall observe that a hard wired
carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addi-
tion, the installing plumber or gas-fitter shall observe that a battery operated or hard wired carbon monoxide detector is installed on each addi-
tional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of
the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or attic, the hard wired carbon monoxide
detector with alarm and battery back-up may be installed on the next adjacent floor level.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of
thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.
1.3.2 Approved Carbon Monoxide Detectors
Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed
and IAS certified.
1.3.3 Signage
A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum of eight (8) feet above grade
directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print
no less the one-half inch (1/2) in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.
1.3.4 Inspection
The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon in-
spection ,the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08 (2) (a) 1
through 4.
1.3.5 Exemptions
The following equipment is exempt from 248 CMR 5.08 (2) (a) 1 through 4:The equipment listed in Chapter 10 entitled “Equipment Not Re-
quired To Be Vented” in the most current edition of NFPA 54 as adopted by the Board; and Product Approved side wall horizontally vented gas
fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential pur-
poses.
When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system design or venting system
components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall
include:
Detailed instructions for the installation of the venting system design or the venting system components; and
A complete parts list for the venting system design or venting system.
When the manufacturer of Product Approved side wall horizontally vented gas equipment does not provide the parts for venting the flue gases,
but identifies “special venting systems”, the following requirements shall be satisfied by the manufacturer:
The referenced “special venting systems” instructions shall be included with the appliance or equipment installation instructions and;
The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and
detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting instructions, all
parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the
installation.
Gas Equipment Venting System Provided
Gas Equipment Venting System Not Provided
1.3.6 Manufacturer Requirements

5
2.0 SPECIFICATIONS
 Vent System: See 11.1, Approved Vent Systems, on page 18 for details.
 Glass Media: Various colors available. See Dealer for details.
2.1 Components
2.1.1 Components List
2.1.2 Additional Components Required
PART NUMBER DESCRIPTION
SL42-150 Control Board Assembly
SL42-135 Burner Assembly
SL42-BLK Light Kit
SL42-057T Glass Frame Assembly
700-408 Remote Control
600-002 Double Receptacle Assembly
942-085 5 in. Restrictor Plate
SL42-028 Fan or Blower Assembly
SL42-HHSS Vent Heat Shield Assembly
AL36-DRAM Rock / Driftwood Accent Media
SL42-500 Driftwood Log Set
SL42-RAM Rock Accent Media
#970 Heat Duct Kit Heat Duct Kit
Natural Gas LP Gas
Minimum Inlet Gas Pressure 5” WC (1.25 kPa) (7” WC [1.74 kPa] recommended) 12” WC (2.99 kPa) (recommended)
Maximum Inlet Gas Pressure 10.5” WC (2.62 kPa) 13” WC (3.24 kPa)
Manifold Pressure (High) 3.8” WC (.95 kPa) 11” WC (2.74 kPa)
Manifold Pressure (Low) 1.1” WC (.27 kPa) 2.9” WC (.72 kPa)
Natural Gas LP Gas
Orifice Size #31 #47
Input BTU/Hr. (kW) 42,000 BTU/hr (12.31 kW) 42,000 BTU/hr (12.31 kW)
Minimum Input BTU/Hr. (kW) 21,000 BTU/hr (6.16 kW) 21,000 BTU/hr (6.16 kW)
2.2 BTU Specifications
2.3 Gas Information

6
1. Frame an opening for fireplace, allowing for vent installation and type of installation (corner or flat wall application). Refer
to 4.0, Framing, on page 10, and 6.0, Typical Installation Options, on page 13.
2. If masonry (optional) is used, prepare foundation for the masonry load. A lintel is required to support the added weight
above fireplace.
3. Attach stand-off brackets and nailing flanges to fireplace. Refer to 3.0, Fireplace Preparation, on page 8.
4. Insert fireplace into framing.
5. Install hearth (if applicable). Refer to 4.2, Floor Support and Protection, on page 11.
6. Complete gas line installation. Refer to 9.0, Gas Line Connection, on page 16.
7. Complete electrical hook-up. Install any standard or optional electrical components at this time. Refer to 10.0, Wiring
Schematics, on page 17.
8. Complete venting installation. Refer to 11.0, Venting, on page 18.
9. Secure fireplace to framing with nailing flanges. Verify all clearances at this point.
10. Install facing material, mantel, or cabinetry; allowing room for the safety barrier. Refer to 5.0, Mantel Requirements, on
page 12; 8.0, Facing and Finishing, on page 15; and 13.2, Safety Barrier Installation, on page 29.
11. Install light kit, and glass media (required). Refer 13.3, Light Kit, and 13.4, Glass Media, on page 31.
12. Install finishing material, optional surrounds. Refer to 8.0, Facing and Finishing, on page 15.
13. Verify proper operation of fireplace and all components. Refer to 18.0, Finalizing the Installation, on page 42.
NOTE
The qualified installer should follow the procedure best suited for the installation.
2.5 Installation Overview
 This fireplace must be installed on a level surface capable of supporting fireplace and venting.
 The fireplace must be placed directly on wood or a non-combustible surface (not linoleum or carpet), extending entire depth
and width of the fireplace.
 Due to high surface temperatures, fireplace should be located out of traffic and away from furniture and draperies.
 This fireplace may be installed in a bedroom.
 Please be aware of the large amount of heat this fireplace will produce when determining a location.
2.4 Placement Clearance Requirements
2.3.1 High Altitude Installations
ATTENTION
USA: The appliance may be installed at higher altitudes. Please refer to your American Gas Association guidelines
which state the sea level rated input of Gas Designed Appliances installed at elevations above 2,000 ft. (610 m) is to be
reduced 4% for each 1,000 ft. (305 m) above sea level. Refer also to National Fuel Gas Code, ANSI Z223.1 / NFPA 54, local
authorities, or codes which have jurisdiction in your area regarding the de-rate guidelines.
Canada: When the appliance is installed at elevations above 4,500 ft. (1,372 m), the certified high altitude rating shall
be reduced at the rate of 4% for each additional 1,000 ft. (305 m). Refer also to CSA-B149.1 Natural Gas and Propane
Installation Code, local authorities, or codes which have jurisdiction in your area regarding the de-rate guidelines.

7
WARNING
All stand-off brackets must be attached to fireplace. Do not remove. Top stand-off brackets are not load bearing.
2.6 Appliance Dimensions and Clearances
Table 2.1, Physical Dimensions
Description Height Width Back Width Depth Opening
Width
Opening
Height
Top Stand-off
Height
Back to Vent
Center
Inches 32-9/16 50 50 15-13/16 45-7/16 19-7/16 5-3/4 9-15/16
Millimeters 827 1271 1271 402 1154 494 146 252
Table 2.2, Appliance Clearances
Top of appliance stand-offs to framing 0 in. 0 mm
From appliance left side & right side stand-offs 0 in. 0 mm
From appliance back stand-offs 0 in. 0 mm
From bottom stand-offs 0 in. 0 mm
Top of finishing edge to ceiling 36 in. 914 mm
Side of finishing edge to adjacent sidewall 6 in. 152 mm
Appliance front to combustibles 36 in. 914 mm
Mantel projection 9 in. (229 mm) deep from fireplace finishing edge* 14-1/4 in. 362 mm
*Refer to 5.0, Mantel Requirements, on page 12.
Figure 2.1, Slayton 42S Dimensions

8
WARNING
Stand-off components are shipped in a flat state. The top and the back stand-off brackets must be formed and installed prior to
positioning the fireplace into a framed opening, in order to provide clearances from the appliance to combustible material.
Top stand-offs provide 5-3/4 in. (146 mm) minimum clearance to header. Use only non-combustible material in this area for the entire
width of fireplace. Do not use wood, sheetrock, etc. in this zone. Other clearances apply. All clearances must be maintained.
1. Remove and save the (4) screws securing the secondary stand-off heat shield and the top stand-off brackets, located on the top of the
fireplace.
2. Form the top stand-off brackets as shown, then re-attach to the fireplace using screws previously removed, along with (4) screws provided
in the fireplace components packet.
3. Form secondary heat shield and attach to top stand-off brackets using (4) screws provided in the fireplace component packet.
4. Form the top stand-off upper heat shield as shown, and attach to top stand-off brackets with the (4) screws provided in the fireplace
component packet.
5. Form back stand-offs and secure to fireplace back with provided screws.
3.0 FIREPLACE PREPARATION
3.1 Stand-Off Assembly and Installation
Figure 3.1, Stand-off Assembly and Installation Diagram

9
3.2 Nailing Flange Assembly and Installation
1. Remove (4) nailing flanges from the sides of the fireplace (as shipped).
2. Align the nailing flanges with the holes on outside corners of fireplace, with the stand-off flange facing away from the
appliance. Secure with the screws (provided in components packet) through slots in nailing flanges.
3. Bend perforation on nailing flange until parallel with fireplace face. Do not bend toward fireplace face.
4. Position framing stud against stand-off (located on the backside of nailing flange). Secure with nails or screws.
NOTE
Depending on facing material, tabs can be adjusted forward or backward up to 1/2 in. (13 mm).
When installed, the nailing flanges provide the minimum 2-1/2 in. (64 mm) clearance from the sides of the fireplace.
Figure 3.4, Nailing Flange Secured into Framing
Figure 3.3, Nailing Flange Installation on Fireplace
CAUTION
Never permanently remove these assemblies from the fireplace—they must be secured regardless of finish material used.

10
4.0 FRAMING
4.1 Wall Enclosure Rough Opening
 Determine whether the wall surface will be flush with the fireplace face, in which the wall surface and fireplace will be
covered with non-combustible material such as tile; or, if the framing will be flush with the fireplace face, which results in a
flat wall appearance.
 Framing studs must maintain 1 in. (25 mm) clearance to venting. Refer to Figure 4.1 Framing Requirements and
Dimensions, for guidance.
 Framing dimensions should allow for wall covering thickness and fireplace facing materials. If using a hearth, adjust rough
opening size as necessary to maintain clearance requirements.
 This fireplace may be elevated off the floor as shown in Figure 4.1, provided it is properly supported by framing materials,
and ceiling clearances are maintained.
 If installing optional #970 Heat Duct Kit, refer to 12.0 #970 Heat Duct Kit, on page 26.
*19 in. (483 mm) represents the minimum distance from the front of the fireplace to back wall of framing. This is the minimum wall
depth required for the wall surface material to cover the fireplace front. If wall surface is desired to be flush with the fireplace face,
subtract 1/2 in. (13 mm) (standard non-combustible board depth) from this dimension. If using another material, adjust accordingly.
WARNING
Provide adequate clearances around air openings into the combustion chamber.
Do not obstruct upper and lower grill openings. Room air enters through the lower passage, is then heated, and exists through
upper passage. Blocking these passages may result in overheating, creating a potentially hazardous situation.
Figure 4.1, Framing Requirements and Dimensions
Table 4.1, Minimum Finished Opening Dimensions
(Opening Bottom to Header) Height 38-3/8 in. (975 mm)
(Opening Bottom to Ceiling) Height 62-1/4 in. (1581 mm)
Width 55-1/4 in. (1403 mm)
Depth* 19 in. (483 mm)
10

11
WARNING
DO NOT RECESS THE VENT CAP INTO WALL OR SIDING.
IMPORTANT
Horizontal vent sections require 1/4 in. (6 mm) rise for every 12 in. (305 mm) of travel.
Vent cap location must be in compliance with the guidelines 11.9 Vent Cap Location Clearances, on page 24.
CAUTION
Cold air transfer area. The surrounding fireplace chase must comply with all clearances as outlined in this manual and be
constructed in compliance with local building codes. Outside walls should be insulated to prevent cold air from entering room.
4.2 Floor Support and Protection
 Determine the exact position of your fireplace, including hearth height, width, and depth. If possible, place the fireplace in
such a manner that the vent termination will be placed between two studs, thus eliminating the need for additional framing.
 If masonry is to be used (optional), prepare the necessary foundation for the masonry load. When masonry construction is
being used, a lintel must be used over top of fireplace to support the added weight.
 Consider the height of hearth finish material (stone, brick, etc.) when building a fireplace platform. The bottom of the
fireplace must be level with finished hearth.
 Build the hearth to desired size and height. If a hearth extension is desired, combustible material may be used.
 Above floor level installations: A solid, continuous platform must be constructed below the appliance.
MINIMUM PLATFORM SIZE: 55-1/4 in. (1403 mm) wide x 19 in. (482 mm) deep.
WARNING
Install the fireplace on a hard metal or wood surface that extends the full width and depth of fireplace.
FIRE HAZARD
Do NOT install directly on carpeting, vinyl, or any combustible material other than wood.
4.3 Vent Termination Framing
Figure 4.2, Min. Horizontal Termination
(Natural Gas)
Figure 4.4, Horizontal Flex Pipe
Vent Termination
Figure 4.3, Min. Horizontal Termination
(LP Gas)
Vertical
Vent Terminations:
Follow vent pipe manufacturer’s installation instructions for vertical vent termination framing.
A minimum of 1 in. (25 mm) clearance on all sides of the vertical vent pipe must be maintained.
Horizontal
Vent Terminations:
Framed openings illustrated in Figures 4.2—4.4 are measured from the bottom of the fireplace
enclosure floor to the center of the pipe to maintain vent system clearances.
A wall thimble with a 1 in. (25 mm) clearance for all vent sides is required for all horizontal vent runs.
48”
(1219mm)
52-1/2”
(1334mm)
19”
(483 mm) 19”
(483 mm)
56”
(1422mm)
19”
(483 mm)

12
WARNING
Non-combustible zone: No combustible materials allowed above the fireplace within shaded area for entire width and depth of the
fireplace, with the exception of the header.
5.0 MANTEL REQUIREMENTS
Figure 5.1, Mantel Projections and Non-Combustible Zone
NOTE
If you plan to mount a television above the fireplace, please refer to 7.0, Recess Construction, on page 14.
1 in. (25 mm) clearance
provided by the horizontal heat
shield above the vent top.
1 in. (25 mm) required
clearance above the vent
top, within the wall thimble.

13
IMPORTANT
The vent heat shield assembly included with this fireplace must be installed for every type of venting configuration. Refer to 11.5, Vent
Heat Shield Assembly Installation, on page 21.
6.0 TYPICAL INSTALLATION OPTIONS
6.1 Horizontal Installation
6.2 Vertical Installation
6.3 Corner Installation
55-1/4”
(1403mm)
13

14
7.1 Television Positioning Considerations
Mounting a TV above a fireplace has become common practice. With this in mind, we conducted tests to determine possible
surface temperatures reached above the fireplace.
Test results determined surface temperatures did not exceed 150°F (66°C) when the following criterium were met:
 4-1/4 in. (108 mm) deep recess constructed above the fireplace. Refer to Figure 7.2, Recess Clearances.
Even though temperature tests were performed, mantel depths, ceiling heights, and other factors will affect surface
temperatures. Thus, we advise you to read the following paragraphs carefully before considering mounting a television above
your fireplace.
Most TV manufacturers specify in their instructions that a TV should not be installed on, near, or above a heat source.
Television location rests solely on the homeowner. Hussong Manufacturing shall not be held liable for any adverse effects that
may be caused by heat on a TV located near a Kozy Heat fireplace.
TV operating temperatures are also affected by wall and mantle construction material. It shall be the customer’s responsibility
to satisfy him or herself that the preferred TV mounting and mantle design will not exceed the listed maximum operating
temperature of their electronic goods.
Table 7.1, Recess Clearances / Non-combustible Zone
Location Clearance
Fireplace Enclosure Ceiling to Appliance Top 31-3/8 in. 797 mm
Fireplace Enclosure Ceiling to Fireplace
Enclosure Floor 62-1/4 in. 1581 mm
Recess Framing to Venting 1 in. 25 mm
Figure 7.2, Recess Clearances
7.0 RECESS CONSTRUCTION
Figure 7.1, Recess Framing
7.2 Recess Framing and Clearances
62-1/4”
(1581mm)
31-3/8”
(797mm)
4-1/4” (108mm)
Maximum Depth
1” (25mm) Minimum
Clearance to Venting
Fireplace Enclosure Floor

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8.0 FACING AND FINISHING
WARNING
Maintain all minimum clearances to combustibles from the fireplace and the vent system.
Combustible Material Allowed
Combustible Material Allowed
No Screws Allowed
Non-Combustible Material Only
Figure 8.3, Minimum Non-Combustible Material Dimensions
 This fireplace is designed to accommodate non-combustible facing material up to 1/2 in. (13 mm) thick. Install non-combustible
facing material up to the finishing edge (Figure 8.2) that surrounds the glass frame assembly. Do not apply any material beyond
this point. The glass frame assembly must be removable.
 Non-combustible material is required at the top and the sides of the fireplace. Figure 8.3 reflects these dimensions.
 Do not secure material to lower cover panel with screws, which may damage control system components. Use a silicone sealant
that has a 300°F (149ºC) continuous exposure rating to secure material in this zone.
 It is acceptable to pre-drill holes and to use self-tapping screws to attach non-combustible material to top and sides of fireplace
face. Do not use excessively long screws.
 Please refer to 13.2, Safety Barrier Installation, on page 29 for barrier dimensions and facing material requirements.
Figure 8.2, Finishing Edge
Figure 8.1, Finished Opened Dimensions

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ATTENTION
In the USA: The appliance may be installed at higher altitudes. Please refer to your American Gas Association
guidelines which state: the sea level rated input of Gas Designed Appliances installed at elevations above 2,000 ft. (610 m) is
to be reduced 4% for each 1,000 ft. (305 m) above sea level. Refer also to National Fuel Gas Code, ANSI Z223.1 / NFPA 54,
local authorities, or codes which have jurisdiction in your area regarding the de-rate guidelines.
In Canada: When the appliance is installed at elevations above 4,500 ft. (1,372 m), the certified high altitude rating
shall be reduced at the rate of 4% for each additional 1,000 ft. (305 m). Refer also to CSA-B149.1 Natural Gas and Propane
Installation Code, Local authorities, or codes which have jurisdiction in your area regarding the de-rate guidelines.
This fireplace is manufactured for use with Natural Gas. Follow the instructions included with the conversion kit if converting to
LP gas. (Sold separately)
ATTENTION
The conversion shall be carried out in accordance with the requirements of the provincial authorities having jurisdiction and in
accordance with the requirements of the ANSI Z223.1 installation code.
CAUTION
Installation of the gas line must only be done by a qualified person in accordance with local building codes, if any. If not, follow
ANSI 223.1.
Commonwealth of Massachusetts: Installation must be done by a licensed plumber or gas fitter.
NOTE
A listed (and Commonwealth of Massachusetts approved) 1/2 in. (13 mm) tee handle manual shut-off valve and flexible gas
connector are to be connected to the 1/2 in. (13 mm) control valve inlet. If substituting for these components, please consult local
codes for compliance.
This fireplace is equipped with a 3/8” (10 mm) x 18” (457 mm) long flexible gas connector and manual shut-off valve. The gas line
should be run to the point of connection where the shut-off valve and flexible gas line will connect.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing
of that system at pressures in excess of ½ psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any
pressure testing of the gas line at test pressures equal to or less than ½ psi (3.5 kPa).
For high altitude installations, consult the local gas distributor or the authority having jurisdiction for proper rating methods.
IMPORTANT
The efficiency rating of this appliance is a product of thermal efficiency rating determined under continuous operating conditions
and was determined independently of any installed system.
Table 9.1, Inlet Gas Pressures
Natural Gas LP Gas
Minimum Inlet Gas Pressure 5” WC (1.25 kPa) [7” WC (1.74 kPa) (recommended)] 12” WC (2.99 kPa) (recommended)
Maximum Inlet Gas Pressure 10.5” WC (2.62 kPa) 13” WC (3.24 kPa)
9.0 GAS LINE CONNECTION
9.1 Gas Conversion
9.2 High Altitude Installations

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IMPORTANT
This system requires 120V of electricity / batteries to operate.
Using the battery back-up will operate the burner only. The fan and light components will not function on battery back-up power.
10.0 WIRING SCHEMATICS
Figure 10.1, IFC Control Module Wiring
IFC Control Module
1.5 V type AA 1.5 V type AA 1.5 V type AA 1.5 V type AA
Flame
Sensor
SW1 Button (red)
Igniter
Pilot
Pilot
Burner
885 Proflame
Battery Pack
Main ON /OFF
Switch
Variable Speed Fan
Appliance
Ground Star
Variable Lights
Male End

18
 This fireplace is designed to be used with any of the following vent systems without the use of an additional adaptor.
 Refer to the vent manufacturer's installation manual for complete installation instructions. Installation must conform with
venting requirements and restrictions as outlined in this manual.
 Provide a means for visually checking the vent connection to the appliance after the fireplace is installed.
IMPORTANT
Consult the local and national installation codes to assure adequate combustion and ventilation air is available. Flame height and
appearance will vary depending upon venting configuration and the type of fuel used.
Table 11.1, Approved Vent systems
Venting Manufacturers Approved Vent System Products Horizontal
Termination
Vertical
Termination
American Metal Products 8” x 5” Direct Vent Chimney System, Model Ameri-Vent XX
BDM 8” x 5” Direct Vent Chimney System XX
ICC 8” x 5” Direct Vent Chimney System, EXCELDirect XX
Kozy Heat #800 Series Flexible Vent System X
Metal Fab 8” x 5” Direct Vent Chimney System, XX
RLH 8” x 5” Direct Vent Chimney System X
Security 8” x 5” Direct Vent Chimney System XX
Selkirk 8” x 5” Direct Vent Chimney System, Model Direct Temp XX
Simpson Dura-Vent DV-PRO 8” x 5” Direct Vent Systems XX
11.0 VENTING
11.1 Approved Vent Systems
11.2 Restrictor Assembly Installation
Slide restrictor into exhaust pipe on top of fireplace with tabs
pointing towards you prior to attaching venting.
 Each installation is unique and affected by various factors
including venting configuration, altitude and climate.
Therefore, after fireplace installation is complete, a
restrictor (included with fireplace components packet)
may be required or may need to be removed or modified.
 Please refer to Figure 11.1 for installation instructions if
installing the restrictor in conjunction with venting. A
restrictor may be used to achieve desired flame
appearance on any venting configuration with 6 ft. (1.83
m) of vertical pipe or more.
 18.3 Restrictors, on page 43, outlines restrictor
recommendations depending on burner flame
appearance and instructions on installation after venting
is completed.
Bend tabs to approx. 80
degree angles to create
tension to hold itself in place
when installed.
Large Restrictor Remove tab(s) to
create small restrictor
Figure 11.1, Restrictor Assembly and Installation Instructions
11.3 Venting for Horizontal Terminations
Table 11.2, All Approved Vent Systems, Clearances to Combustible Material
Top Bottom Sides
Vent Pipe Surface Clearances 1 in. (25 mm) 1 in. (25 mm) 1 in. (25 mm)
11.3.1 Horizontal Vent Section Clearances

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11.3.2 Horizontal Venting Configurations
IMPORTANT
The vent heat shield assembly included with this fireplace must be installed for every type of venting application. Refer to 11.5, Vent
Heat Shield Assembly Installation, on page 21.
This fireplace requires a wall pass through thimble with a minimum of 1 in. (25 mm) clearance for all horizontal vent terminations.
Horizontal vent sections require 1/4 in. (6 mm) rise for every 12 in. (305 mm) of travel.
SLA-42S (NG)
Minimum Vertical
Vent Pipe Length
Minimum Horizontal
Vent Pipe Length
Maximum
Horizontal Run
9 in. 229 mm 9 in. 229 mm 12 ft. 3.66 m
SLA-42S (LP)
Minimum Vertical
Vent Pipe Length
Minimum Horizontal
Vent Pipe Length
Maximum
Horizontal Run
9 in. + 6 in. 229 mm + 152 mm 9 in. 229 mm 12 ft. 3.66 m
Figure 11.2, NG Min / Min Horizontal Venting
Stand-Offs
Brackets
90° Elbow
Termination
Cap
9” (229mm) Vent Pipe
9” (229mm)
Vent Pipe
Horizontal Vent
Heat Shield
Vertical Vent
Heat Shield
Figure 11.3, NG Min / Max Horizontal Venting
Termination
Cap
12’
(3.66m)
Horizontal Vent
Heat Shield
Stand-Offs
Brackets
90° Elbow
Vertical Vent
Heat Shield
9” (229mm)
Vent Pipe
Figure 11.4, LP Min / Min Horizontal Venting
Termination
Cap
Stand-Offs
Brackets
Figure 11.5, LP Min / Max Horizontal Venting
90° Elbow
12’
(3.66 m)
Vertical Vent
Heat Shield
Horizontal Vent
Heat Shield
6” (152mm) Vent Pipe
9” (229mm) Vent Pipe
Stand-Offs
Brackets
Vertical Vent
Heat Shield
90° Elbow
9” (229mm) Vent Pipe
6” (152mm) Vent Pipe
Horizontal Vent
Heat Shield
9” (229mm) Vent Pipe
Termination
Cap